Super Puffs...

Venusian Broon

Defending the SF genre with terminal intensity
Dec 7, 2011
Edinburgh not an extra sugar-coated breakfast cereal but instead the discovery of some very large but very low density planets who are as dense as cotton candy:

Sweet Super-Puffs: These 2 Exoplanets Have the Density of Cotton Candy

I bring this up with reference to SF, because it always seems, in many Space Opera/SF or otherwise we have the characters are flying about analogues to our own staid Solar System, but actually the amazing data coming back from the Kepler and Hubble telescopes and other observatories shows the huge range in planets and solar systems that really exist.
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